Marathon President and CEO to Present at Merrill Lynch Global Energy Conference.

HOUSTON, Oct. 26 /PRNewswire-FirstCall/ -- Marathon Oil Corporation today announced that Clarence P. Cazalot, Jr., Marathon president and CEO, will be presenting at the Merrill Lynch Global Energy Conference in New York, on November 3, at 10:30 a.m. EST.

A live audio webcast of Cazalot's remarks will be accessible via Marathon's Web site at http://www.marathon.com/ . The presentation and associated question and answer session is expected to last approximately 30 minutes and may include forward-looking information. A replay of the presentation will be available and archived on Marathon's Web site through November 17, 2005.

Marathon is the fourth-largest U.S.-based fully integrated international energy company engaged in exploration and production; integrated gas; and refining, marketing and transportation operations. Marathon is the fifth largest refiner in the U.S. with 948,000 barrels-per-day of crude processing capacity in its seven-refinery system. For more information about Marathon, please visit the company's Web site at http://www.marathon.com/ .

CONTACT: media relations, Paul Weeditz, [phone], or Scott Scheffler, [phone], or investor relations, Ken Matheny, [phone], or Howard Thill, [phone], all of Marathon Oil Corporation

Web site: http://www.marathon.com/